diff options
Diffstat (limited to 'testsuite/tests/partial-sigs/should_compile/T10403.stderr')
| -rw-r--r-- | testsuite/tests/partial-sigs/should_compile/T10403.stderr | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/testsuite/tests/partial-sigs/should_compile/T10403.stderr b/testsuite/tests/partial-sigs/should_compile/T10403.stderr index fd38a126c2..38f562a516 100644 --- a/testsuite/tests/partial-sigs/should_compile/T10403.stderr +++ b/testsuite/tests/partial-sigs/should_compile/T10403.stderr @@ -15,17 +15,34 @@ T10403.hs:16:12: warning: [-Wpartial-type-signatures (in -Wdefault)] T10403.hs:20:7: warning: [-Wpartial-type-signatures (in -Wdefault)] • Found type wildcard ‘_’ - standing for ‘(a1 -> a2) -> B t0 a1 -> H (B t0)’ - Where: ‘t0’ is an ambiguous type variable + standing for ‘(a1 -> a2) -> f0 a1 -> H f0’ + Where: ‘f0’ is an ambiguous type variable ‘a2’, ‘a1’ are rigid type variables bound by - the inferred type of h2 :: (a1 -> a2) -> B t0 a1 -> H (B t0) + the inferred type of h2 :: (a1 -> a2) -> f0 a1 -> H f0 at T10403.hs:23:1-41 • In the type signature: h2 :: _ +T10403.hs:23:15: warning: [-Wdeferred-type-errors (in -Wdefault)] + • Ambiguous type variable ‘f0’ arising from a use of ‘fmap’ + prevents the constraint ‘(Functor f0)’ from being solved. + Relevant bindings include + b :: f0 a1 (bound at T10403.hs:23:6) + h2 :: (a1 -> a2) -> f0 a1 -> H f0 (bound at T10403.hs:23:1) + Probable fix: use a type annotation to specify what ‘f0’ should be. + Potentially matching instances: + instance Functor IO -- Defined in ‘GHC.Base’ + instance Functor (B t) -- Defined at T10403.hs:11:10 + ...plus 8 others + ...plus one instance involving out-of-scope types + (use -fprint-potential-instances to see them all) + • In the second argument of ‘(.)’, namely ‘fmap (const ())’ + In the expression: (H . fmap (const ())) (fmap f b) + In an equation for ‘h2’: h2 f b = (H . fmap (const ())) (fmap f b) + T10403.hs:29:8: warning: [-Wdeferred-type-errors (in -Wdefault)] - • Couldn't match type ‘t0’ with ‘t’ + • Couldn't match type ‘f0’ with ‘B t’ Expected: H (B t) - Actual: H (B t0) + Actual: H f0 • because type variable ‘t’ would escape its scope This (rigid, skolem) type variable is bound by the type signature for: |